36. In given fig. capacitor C is initially charged with voltage V₀ with upper plate positive. Switch S is closed at t = 0. At t = 0⁺, V_C and i are respectively:
    
    
    
    

1. 1. 0,	V0
      	R

   
   
   

   2. – V0,	V0
      	R

   
   
   

   3. – V0,–	V0
      	R

   
   
   

   4. V0,	V0
      	R

   
   
   

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   NA

   Correct Option: B

   NA

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37. The speed and torque of induction motors can be varied by which of the following means:
    1. Stator voltage control
    2. Rotor voltage control
    3. Frequency control
    

1. 1. 1 only
      

   
   
   

   2. 2 only
      

   
   
   

   3. 1 and 2 only
      

   
   
   

   4. 1, 2 and 3

   
   
   

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   NA

   Correct Option: D

   NA

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38. In resonance pulse inverters:
    

1. 1. DC output voltage variation is wide
      

   
   
   

   2. The frequency is low
      

   
   
   

   3. The output voltage is never sinusoidal
      

   
   
   

   4. DC saturation of transformer core is minimised

   
   
   

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   NA

   Correct Option: D

   NA

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39. A voltage source inverter is normally employed when:
    

1. 1. Source inductance is large and load inductance is small
      

   
   
   

   2. Source inductance is small and load inductance is large
      

   
   
   

   3. Both source and load inductances are small
      

   
   
   

   4. Both source and load inductances are large

   
   
   

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   NA

   Correct Option: C

   NA

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40. Use of a reverse conducting thyristor in place of antiparallel combination of thyristor and feedback diode in a inverter:
    

1. 1. Effectively minimises the peak commutating current
      

   
   
   

   2. Decreases the operating frequency of operation
      

   
   
   

   3. Minimises the effects of load inductance on the commutation performance
      

   
   
   

   4. Causes deteriorationin the commutation performance

   
   
   

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   NA

   Correct Option: D

   NA

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